The persuasive technique he used in this sentence of the declaration of independence was commitment and coherence.
Persuasion is the deliberate use of communication to change, form or reinforce people's attitudes, understanding attitudes, as a summary of what we think of things, people, groups, actions or ideas. Persuasion is based on two fundamental pillars: credibility and trust.
Psychological factors motivate others to believe and follow another person and are strong imprints in persuasion. Feeling loved is an excellent example. When you show commitment to someone you are showing that you care.
